Tagging onto this thread. Have an international connection in business class (so should be quick to exit) at ICN in mid Jan with 5 1/2 hr transit time. Have booked the 2hrs transit tours (temple and Incheon landing) but then started to wonder if I can squeeze a trip to Seoul. Thinking of AREX train and then visit the war museum which is just to the south of Seoul station.

Anyone done this before? I know I won't have much time but the exhibits there are amazing, including a B52. Also knowing it'll be in mid-winter, I wonder how realistic it's going to be to be walking on the streets of Seoul?

Thoughts and ideas? Any other options?